Former UFC heavyweight champion  Francis Ngannou made his Professional Fighters League (PFL) debut last weekend in Riyadh, Saudi Arabia.  ”The Predator” took on  Renan Ferreira in the fight card’s main event and scored a first-round knockout. Ngannou perfectly timed a takedown attempt, ducking under a punch from Ferreira and putting the Brazilian on his back.  He maintained position, fended off a triangle choke attempt and delivered left hands until Ferreira was  removed from consciousness